Sherlock fans get chance to solve new mystery via Twitter

Sherlock fans will have the chance to put their own powers of deduction to the test with a special case written to be solved on social media.

Steven Moffat and Mark Gatiss, the show's writers, will be tweeting live to fans in character as Sherlock to help crack a brand new mystery.

Sherlock (BBC/Hartswood Films/Todd Antony)

The case, dubbed #SherlockLive and penned by Joe Lidster, will unfold over 30 minutes on the BBC One Twitter account, @BBCOne, and will be available to follow as a liveblog on bbc.co.uk/sherlock from 8pm on Tuesday.

The show, starring Benedict Cumberbatch and Martin Freeman, returned to television on January 1.